Pen



FIG. 1 is a perspective view of a pen showing my new design;

FIG. 2 is a right side elevational view of the pen of FIG. 1;

FIG. 3 is a left side elevational view of the pen of FIG. 1;

FIG. 4 is a front elevational view of the pen of FIG. 1;

FIG. 5 is a rear elevational view of the pen of FIG. 1;

FIG. 6 is a top plan view of the pen of FIG. 1;

FIG. 7 is a bottom plan view of the pen of FIG. 1; and,

FIG. 8 is a right side elevational of the pen of FIG. 1, with pen cap removed. 

CLAIM The ornamental design for a pen, as shown and described. 